PIC17C42 Microchip Technology, PIC17C42 Datasheet - Page 12

• Manufacturer Part Number: PIC17C42
• Description: High-Performance 8-Bit CMOS EPROM/ROM Microcontroller
• Manufacturer: Microchip Technology

PIC17C4X
TABLE 3-1:
DS30412C-page 12
OSC1/CLKIN
OSC2/CLKOUT
MCLR/V
RA0/INT
RA1/T0CKI
RA2
RA3
RA4/RX/DT
RA5/TX/CK
RB0/CAP1
RB1/CAP2
RB2/PWM1
RB3/PWM2
RB4/TCLK12
RB5/TCLK3
RB6
RB7
RC0/AD0
RC1/AD1
RC2/AD2
RC3/AD3
RC4/AD4
RC5/AD5
RC6/AD6
RC7/AD7
Legend: I = Input only; O = Output only; I/O = Input/Output; P = Power; — = Not Used; TTL = TTL input;
Name
PP
ST = Schmitt Trigger input.
PINOUT DESCRIPTIONS
DIP
No.
19
20
32
26
25
24
23
22
21
11
12
13
14
15
16
17
18
2
3
4
5
6
7
8
9
PLCC
No.
35
28
26
25
19
20
10
21
22
27
24
23
13
14
15
16
17
18
3
4
5
6
7
8
9
QFP
No.
37
38
44
43
42
41
40
39
29
30
31
32
33
34
35
36
19
20
21
22
23
24
25
26
7
I/O/P
Type
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/P
O
I
I
I
Buffer
Type
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
—
Description
External clock input in external clock mode.
oscillator mode. In RC oscillator or external clock modes
OSC2 pin outputs CLKOUT which has one fourth the fre-
quency of OSC1 and denotes the instruction cycle rate.
This is the active low reset input to the chip.
PORTA is a bi-directional I/O Port except for RA0 and RA1
which are input only.
PORTB is a bi-directional I/O Port with software configurable
weak pull-ups.
PORTC is a bi-directional I/O Port.
Oscillator input in crystal/resonator or RC oscillator mode.
Oscillator output. Connects to crystal or resonator in crystal
Master clear (reset) input/Programming Voltage (V
input. Interrupt can be configured to be on positive or
negative edge.
input, and the interrupt can be configured to be on posi-
tive or negative edge. RA1/T0CKI can also be selected
to be the clock input to the Timer0 timer/counter.
pins.
pins.
Asynchronous Receive or USART (SCI) Synchronous
Data.
Asynchronous Transmit or USART (SCI) Synchronous
Clock.
Timer1 and Timer2.
Timer3.
in microprocessor mode or extended microcontroller
mode. In multiplexed system bus configuration, these
pins are address output as well as data input or output.
RA0/INT can also be selected as an external interrupt
RA1/T0CKI can also be selected as an external interrupt
High voltage, high current, open drain input/output port
High voltage, high current, open drain input/output port
RA4/RX/DT can also be selected as the USART (SCI)
RA5/TX/CK can also be selected as the USART (SCI)
RB0/CAP1 can also be the CAP1 input pin.
RB1/CAP2 can also be the CAP2 input pin.
RB2/PWM1 can also be the PWM1 output pin.
RB3/PWM2 can also be the PWM2 output pin.
RB4/TCLK12 can also be the external clock input to
RB5/TCLK3 can also be the external clock input to
This is also the lower half of the 16-bit wide system bus
1996 Microchip Technology Inc.
PP
) input.